-ein Definition

ēn, ēin
suffix
A chemical compound related to a specified compound with a similar name ending in –in or –ine:
Phthalein.
American Heritage
affix
Used to differentiate a compound from another having a similar spelling but ending in -in or -ine.
Webster's New World
Used to indicate a compound containing an internal anhydride.
Webster's New World
abbreviation
(US, taxation) Employer Identification Number.
Wiktionary

Origin of -ein

  • altered < -in & -ine

    From Webster's New World College Dictionary, 5th Edition

  • Alteration of –in

    From American Heritage Dictionary of the English Language, 5th Edition

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-ein